Abstract. Miocene marl is one of the widespread geological substrates in Fez vicinity (Central Morocco). In this study we proceed by a physicochemical characterization of the marl after doping with metal oxides, by various analytical techniques, namely the X-ray fluorescence, the mineralogical analysis, and dielectric property. The doping of these marl was conducted by solid oxides of Al 2 O 3 at different percentages (5%, 10% and 15%). The results of chemical analysis showed the Al 2 O 3 increase during doping. So, the mineralogical analysis of doped clays shows peaks' increases for kaolin. The marl doped acquired the property of their good electrical conductor compared to crass marl. IntroductionThe marl's minerals are abundant untreated material in several areas worldwide. They are often under-valued for human use. However, due to demands of the society in terms of sustainability and energy saving, the valuation of these resources to develop new materials, most environmentally friendly has become a concern both scientific and industrial aims.Ceramics are the growing research to obtain materials with good chemical stability and good hot properties (Jouenne, 1984). The balance between these properties and industrial requirements allowed clay materials uses at craft departure (pottery, tile), to progress towards high-tech applications such as electrical and thermal insulation, electric candle, sound insulation, etc. (Louet, 2003).

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